How Do I Determine Replacement Wheel Bearing Sizes?
Stock trailer wheel bearings, along with other types of trailers, are specific to the spindle that is installed on the axle on your trailer.
To determine the wheel bearing size, you will first need to safely support the trailer. Once you’ve done this you can remove the wheel and tire, then the grease cap, the cotter pin and washer that secure the spindle nut and then the spindle nut itself. Then you will be able to remove the hub from your trailer.
Once you’ve done this, you can get the part numbers from the inner and outer bearings to determine the correct replacements parts for your spindles.
How To Install Stock Trailer Bearings?
Whether you are installing or replacing your trailer bearings, you will need a pair of pliers, a lug wrench, a hammer, a flathead screwdriver and the necessary means to jack the wheel up safely. Start by loosening the lug nuts with the lug wrench. Once the wheel is safely up in the air, just follow these simple steps.
Once you have completely removed the lug nuts and tire, follow by removing the dust cap or, if you are using one, the bearing protector. The dust cap can be removed by using a screwdriver to pry it off, but a bearing protector will most likely require a few light taps with a hammer. The cotter pin that holds the castle nut in place will need to be straightened out and removed to gain access to the bearings. Then the castle nut and washer can be removed.
The next step is the removal of the wheel hub, which an be done by simply sliding off the central spindle. Once this is done, pull the outer bearing off the hub. If the outer bearing is stuck you might have to rock the hub or tap it with a mallet. Next, lay the hub down with the outer bearing facing up. Then remove the outer bearing and spindle washer, and set them aside so you can then pry off the inner seal and remove the inner bearing.
Then, you will want to take the inner and outer bearings out to clean them and remove as much grease as possible. This can be down with rags and washing them with a solvent or degreaser and set them out to dry. Inspect the parts once they are dry to make sure there are no signs of rust, corrosion or other visible damage. Once you have cleaned and dried the parts appropriately, you can apply some fresh bearing grease and pack the bearings with as much grease as they can hold. This can be done by hand or with a bearing packer. Be sure to also grease the spindle. Once the bearings are packed, insert the inner bearing and seal, followed by the outer bearing and seal. Then the washer, castle nut and dust cap or bearing protector can be installed. Put the the wheel back on and jack trailer back down once you completed the installation.